304 The Molluscan Family Planorbidae 



PLATE 34 



Carinifex ponsonbyi E. A. Smith 

 From Upper Klamath Lake, Oregon; collected by J. Henderson. 



1. Head and foot showing pseudobranch and pneumostome. 



2. Penial complex showing muscle system and short penial gland duct. 



3. Penial complex cut open to show verge and penial gland. 



4. Genitalia dissected and organs separated. Shows unusual position of spermatheca. 



5. Albumen gland from below. 



6. Portion of genitalia showing relationship of oviduct, sperm duct, ovisperm duct. 



and duct to albumen gland. 



7. Cross section of prostate and uterus. 



8. Cross section of prostate near distal end. 



9. Cross section of ovotestis near proximal end. 



10. Section through penial gland to show duct and folds. 



IL Vagina and spermatheca of different form. 



12. Cross section of preputial sac to show ^'ertical ridges or pilasters. 



Line near figure indicates 1 mm. in length. Figure 12 has 

 same magnification as fig. 2. 



